All-time records

GB electricity records

The grid's record book, recomputed over every half-hour since 2009: the greenest moments, the biggest peaks, and the milestones of the coal-to-renewables transition. Each record links to its own page.

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Greenest half-hour: 19 gCO₂/kWh; 2024-04-15
Dirtiest half-hour: 644 gCO₂/kWh; 2012-03-13
Peak wind: 23.9 GW; 2026-03-25
Peak solar: 16.3 GW; 2026-04-23
Peak gas: 27.9 GW; 2024-12-12
Peak generation: 59.6 GW; 2010-01-07
Highest renewable share: 79.7%New record; 2026-06-28
Highest low-carbon share: 94.9%; 2025-05-29
Windiest half-hour: 73.6%; 2025-10-26
Sunniest half-hour: 46.6%; 2026-05-24
Greenest day: 40.5 gCO₂/kWh; 2024-04-05
Dirtiest day: 604.9 gCO₂/kWh; 2009-01-09
Longest coal-free run: 678.1 days; 2026-08-09
First coal-free day: 2017-10-01
First day wind beat gas: 2012-12-23
Peak demand: 59.1 GW; 2010-12-20
Lowest demand: 12.6 GW; 2026-05-24
Most curtailed day: 132.4 GWh; 2025-02-23
Most curtailed half-hour: 3.8 GWh; 2025-12-19

As of 2026-08-15. Records exclude eras a fuel wasn't tracked (no fabricated zeros) and demand records are net of embedded generation.

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